Dark dirt marks around the edges of your carpet are caused by an issue called filtration soiling.
Dirt around edge of carpet.
The first step to preventing filtration soiling is to be sure that your ducts are clean.
The carpet acts as a filter gathering the dirt from the air.
You can also use a dampened white rag to scrub your carpet edges.
According to procare the premium carpet upholstery care specialists.
Preventing filtration lines filtration soil around the edges of the room is a fact of life in most homes with central air systems but you can minimize it by cleaning your furnace air filters regularly or replacing them when they are dirty.
This will help release any trapped dirt dust or debris.
Start with the hvac system.
Let the carpet dry then vacuum again to remove any surface dirt and loose fibers that remain.
Along the corners of a room.
Make 2 3 passes along the skirting boards with your scrub brush.
Along the lines of floorboards under carpet only in extreme cases.
While your carpet edges are still damp use your carpet edge cleaning brush toothbrush or grout cleaning brush to scrub the carpet.
This soiling is called filtration soiling because it comes from air passing through the carpet as it is attempting to get through the crack between the.
Filtration soiling is pollution that comes from dirty ductwork and settles on your carpet.
To clean up these stains you need water and vigorous scrubbing.
As the air is forced through the ventilation system it picks up whatever dirt is in the ducts and carries it into the living areas of the home and thus potentially into the carpet.
You can find evidence of filtration soiling anywhere airflow is restricted near carpeting.
You may need to use detergent for more persistent stains.
Along the edges of carpeted stairs.